Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) - Norwegian Kroner $ in Thousands	Dec. 31, 2017 USD ($) kr / $	Dec. 31, 2017 NOK (kr) kr / $
Derivative [Line Items]
Average Forward Rate \| kr / $	8.23	8.23
Fair Value / Carrying Amount of Asset (Liability)	$ 81
Expected Maturity	$ 12,153
Foreign currency forward contracts
Derivative [Line Items]
Contract Amount in Foreign Currency \| kr		kr 100,000,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Expected maturity amount of foreign currency derivatives in next fiscal year.

+ References

No definition available.

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- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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